I have Rivatuner 2.07 installed right now, when I attempt to run it with driver signing disabled it tells me I can't because Vista requires a signed driver, not fixed for me. If somebody could explain that I'd be grateful.

After removing the registry keys I got it to work fine. The problem occurs when you try to install Rivatuner when you've had UAC on, it keeps the settings even when it's off and doesn't allow you to install.

Looks like things have gotten straightened out in here. You can bypass driver signing completely by going into your command prompt within windows. So click on the start button and in the search "type in command" this will bring up your command prompt. The type in the following: Bcdedit.exe/set nointegritychecks ON

This should effectively bypass the driver signing check process. Another note is that I've also heard that some windows updates have caused this feature not to function properly but I have not experienced this. So if it fails to work and causes you errors simply go back into your command prompt and type in the same command but instead of "ON" just change that too "OFF" at the end of command and it will put everything back how it was. I have attached some .jpgs of the procedure.